Picture frame



FIG. 1 is a perspective view of the picture frame;

FIG. 2 is a front elevational view of the picture frame;

FIG. 3 is a rear elevational view of the picture frame;

FIG. 4 is a left side elevational view of the picture frame;

FIG. 5 is a right side elevational view of the picture frame;

FIG. 6 is a top plan view of the picture frame; and,

FIG. 7 is a bottom plan view of the picture frame.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a picture frame, as shown. 